Bearing device for crankshaft of internal combustion engine
a technology for internal combustion engines and bearings, which is applied in the direction of sliding contact bearings, machines/engines, rigid support of bearing units, etc., can solve the problems of increased mechanical loss of internal combustion engines, difficulty in providing oil to the sliding surface of halved bearings, and seizure, so as to increase the amount of oil to be supplied and reduce the amoun
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example 1
[0055]FIG. 1 is a schematic view of a bearing device 1 of the crankshaft 3 of the present invention as applied to an in-line four-cylinder internal combustion engine. FIG. 2 shows a bearing structure of journal portions 61 (No. 2 and No. 4 journal portions (61A, 61B) in FIG. 1) having a lubricating oil passage 63a for supplying oil to the crank pin portion 5 of the bearing device 1 shown in FIG. 1. (hereinafter, “journal portion with a lubricating oil passage” will be referred to as “first journal portion”) FIG. 3 shows a bearing structure of a journal portion 62 (No. 1, No. 3, and No. 5 journal portions (62A, 62B, 62C) in FIG. 1) without a lubricating oil passage for supplying oil to the crank pin portion 5 of the bearing device 1 shown in FIG. 1. (hereinafter, “journal portion without a lubricating oil passage” is referred to as “second journal portion”)
(Overall Configuration of Bearing Device)
[0056]As shown in FIG. 1, the bearing device 1 of the present example includes five jour...
example 2
[0101]Hereinafter, with reference to FIGS. 11 and 12, a second main bearing 42A which includes an upper-side halved bearing 42AU having a form which is different from Example 1 and for supporting the second journal portion 62 will be described. The description of portions which are same as or equivalent to those described in Example 1 is referred to by like numerals.
(Configuration)
[0102]First, the configuration will be described. The configuration of the first main bearing 41 for supporting the first journal portion 61 of this Example is the same as that of Example 1. The configuration of the second main bearing 42A is generally the same as that of Example 1 except for the shape of the oil groove 42G of the upper-side halved bearing 42AU.
[0103]Specifically, circumferential both end portions of the oil groove 42G of this Example is configured to communicate with the crush relief 70 and 70 at both end portions of the upper-side halved bearing 42AU in the circumferential direction.
(Eff...
example 3
[0106]Hereinafter, with reference to FIGS. 13 and 14, a second main bearing 42B which includes an upper-side halved bearing 42BU having a form which is different from Example 1 and 2, and for supporting the second journal portion 62 will be described. The description of portions which are same as or equivalent to those described in Example 1 and 2 is referred to by like numerals.
(Configuration)
[0107]First, the configuration will be described. The configuration of the first main bearing 41 for supporting the first journal portion 61 of this Example is the same as that of Example 1. The configuration of the second main bearing 42B is generally the same as that of Example 1 except for the shape of the oil groove 42G of the upper-side halved bearing 42BU.
[0108]Specifically, as shown in FIG. 13, the groove depth D2 of the oil groove 42G of this Example is configured to be minimum at the circumferential end face 72 of the oil groove 42G on the rotationally backward side of the journal por...
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